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2016 ; 213
(5
): 751-69
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Continuous inhibitory signaling by both SHP-1 and SHIP-1 pathways is required to
maintain unresponsiveness of anergic B cells
#MMPMID27114609
Getahun A
; Beavers NA
; Larson SR
; Shlomchik MJ
; Cambier JC
J Exp Med
2016[May]; 213
(5
): 751-69
PMID27114609
show ga
Many autoreactive B cells persist in the periphery in a state of unresponsiveness
called anergy. This unresponsiveness is rapidly reversible, requiring continuous
BCR interaction with self-antigen and resultant regulatory signaling for its
maintenance. Using adoptive transfer of anergic B cells with subsequent acute
induction of gene deletion or expression, we demonstrate that the continuous
activities of independent inhibitory signaling pathways involving the tyrosine
phosphatase SHP-1 and the inositol phosphatase SHIP-1 are required to maintain
anergy. Acute breach of anergy by compromise of either of these pathways leads to
rapid cell activation, proliferation, and generation of short-lived plasma cells
that reside in extrafollicular foci. Results are consistent with
predicted/observed reduction in the Lyn-SHIP-1-PTEN-SHP-1 axis function in B
cells from systemic lupus erythematosus patients.